Back plate for a heat sink



FIG. 1 is a top perspective view of a back plate for a heat sink showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left view thereof;

FIG. 5 is a right view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof;

FIG. 8 is a bottom perspective view thereof; and,

FIG. 9 is an operational perspective view thereof, showing the back plate mounted on a bottom of a heat sink, the broken lines are shown for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a back plate for a heat sink, as shown and described. 